magic-name-badge.py

import asyncio
from datetime import datetime
from bleak import BleakClient, BleakScanner

#devs = await BleakScanner.discover(timeout=10.0, service_uuids=['0000fee0-0000-1000-8000-00805f9b34fb'])
#assert len(devs) == 1
device_address = 'XX:XX:XX:XX:XX:XX'

# From https://github.com/fossasia/badgemagic-app/blob/development/lib/bademagic_module/utils/data_to_bytearray_converter.dart
char_codes = {
    '0': "007CC6CEDEF6E6C6C67C00",
    '1': "0018387818181818187E00",
    '2': "007CC6060C183060C6FE00",
    '3': "007CC606063C0606C67C00",
    '4': "000C1C3C6CCCFE0C0C1E00",
    '5': "00FEC0C0FC060606C67C00",
    '6': "007CC6C0C0FCC6C6C67C00",
    '7': "00FEC6060C183030303000",
    '8': "007CC6C6C67CC6C6C67C00",
    '9': "007CC6C6C67E0606C67C00",
    '#': "006C6CFE6C6CFE6C6C0000",
    '&': "00386C6C3876DCCCCC7600",
    '_': "00000000000000000000FF",
    '-': "0000000000FE0000000000",
    '?': "007CC6C60C181800181800",
    '@': "00003C429DA5ADB6403C00",
    '(': "000C183030303030180C00",
    ')': "0030180C0C0C0C0C183000",
    '=': "0000007E00007E00000000",
    '+': "00000018187E1818000000",
    '!': "00183C3C3C181800181800",
    '\'': "1818081000000000000000",
    ':': "0000001818000018180000",
    '%': "006092966C106CD2920C00",
    '/': "000002060C183060C08000",
    '"': "6666222200000000000000",
    '[': "003C303030303030303C00",
    ']': "003C0C0C0C0C0C0C0C3C00",
    ' ': "0000000000000000000000",
    '*': "000000663CFF3C66000000",
    ',': "0000000000000030301020",
    '.': "0000000000000000303000",
    '$': "107CD6D6701CD6D67C1010",
    '~': "0076DC0000000000000000",
    '{': "000E181818701818180E00",
    '}': "00701818180E1818187000",
    '<': "00060C18306030180C0600",
    '>': "006030180C060C18306000",
    '^': "386CC60000000000000000",
    '`': "1818100800000000000000",
    ';': "0000001818000018180810",
    '\\': "0080C06030180C06020000",
    '|': "0018181818001818181800",
    'a': "00000000780C7CCCCC7600",
    'b': "00E060607C666666667C00",
    'c': "000000007CC6C0C0C67C00",
    'd': "001C0C0C7CCCCCCCCC7600",
    'e': "000000007CC6FEC0C67C00",
    'f': "001C363078303030307800",
    'g': "00000076CCCCCC7C0CCC78",
    'h': "00E060606C76666666E600",
    'i': "0018180038181818183C00",
    'j': "0C0C001C0C0C0C0CCCCC78",
    'k': "00E06060666C78786CE600",
    'l': "0038181818181818183C00",
    'm': "00000000ECFED6D6D6C600",
    'n': "00000000DC666666666600",
    'o': "000000007CC6C6C6C67C00",
    'p': "000000DC6666667C6060F0",
    'q': "0000007CCCCCCC7C0C0C1E",
    'r': "00000000DE76606060F000",
    's': "000000007CC6701CC67C00",
    't': "00103030FC303030341800",
    'u': "00000000CCCCCCCCCC7600",
    'v': "00000000C6C6C66C381000",
    'w': "00000000C6D6D6D6FE6C00",
    'x': "00000000C66C38386CC600",
    'y': "000000C6C6C6C67E060CF8",
    'z': "00000000FE8C183062FE00",
    'A': "00386CC6C6FEC6C6C6C600",
    'B': "00FC6666667C666666FC00",
    'C': "007CC6C6C0C0C0C6C67C00",
    'D': "00FC66666666666666FC00",
    'E': "00FE66626878686266FE00",
    'F': "00FE66626878686060F000",
    'G': "007CC6C6C0C0CEC6C67E00",
    'H': "00C6C6C6C6FEC6C6C6C600",
    'I': "003C181818181818183C00",
    'J': "001E0C0C0C0C0CCCCC7800",
    'K': "00E6666C6C786C6C66E600",
    'L': "00F060606060606266FE00",
    'M': "0082C6EEFED6C6C6C6C600",
    'N': "0086C6E6F6DECEC6C6C600",
    'O': "007CC6C6C6C6C6C6C67C00",
    'P': "00FC6666667C606060F000",
    'Q': "007CC6C6C6C6C6D6DE7C06",
    'R': "00FC6666667C6C6666E600",
    'S': "007CC6C660380CC6C67C00",
    'T': "007E7E5A18181818183C00",
    'U': "00C6C6C6C6C6C6C6C67C00",
    'V': "00C6C6C6C6C6C66C381000",
    'W': "00C6C6C6C6D6FEEEC68200",
    'X': "00C6C66C7C387C6CC6C600",
    'Y': "00666666663C1818183C00",
    'Z': "00FEC6860C183062C6FE00",
    'Á': "0810386cc6c6fec6c6c600",
    'À': "2010386cc6c6fec6c6c600",
    'Â': "1028386CC6C6FEC6C6C600",
    'Ä': "2800386CC6C6FEC6C6C600",
    'Å': "1028107CC6C6FEC6C6C600",
    'É': "0810FE626878686266FE00",
    'È': "2010FE626878686266FE00",
    'Ê': "1028FE626878686266FE00",
    'Ë': "2800FE626878686266FE00",
    'Ě': "2810FE626878686266FE00",
    'Í': "04083C1818181818183C00",
    'Ì': "10083C1818181818183C00",
    'Î': "08143C1818181818183C00",
    'Ï': "14003C1818181818183C00",
    'Ó': "08107CC6C6C6C6C6C67C00",
    'Ò': "20107CC6C6C6C6C6C67C00",
    'Ô': "10287CC6C6C6C6C6C67C00",
    'Ö': "28007CC6C6C6C6C6C67C00",
    'Ő': "14287CC6C6C6C6C6C67C00",
    'Ú': "0810C6C6C6C6C6C6C67C00",
    'Ù': "2010C6C6C6C6C6C6C67C00",
    'Û': "1028C6C6C6C6C6C6C67C00",
    'Ü': "2800C6C6C6C6C6C6C67C00",
    'Ű': "1428C6C6C6C6C6C6C67C00",
    'Ů': "102810C6C6C6C6C6C67C00",
    'Ý': "04086666663C1818183C00",
    'Ÿ': "14006666663C1818183C00",
    'á': "00000810780C7CCCCC7600",
    'à': "00002010780C7CCCCC7600",
    'â': "00102800780C7CCCCC7600",
    'ä': "00002800780C7CCCCC7600",
    'å': "00102810780C7CCCCC7600",
    'é': "000008107CC6FEC0C67C00",
    'è': "000020107CC6FEC0C67C00",
    'ê': "001028007CC6FEC0C67C00",
    'ë': "000028007CC6FEC0C67C00",
    'ě': "000028107CC6FEC0C67C00",
    'í': "0000081038181818183C00",
    'ì': "0000201038181818183C00",
    'î': "0008140038181818183C00",
    'ï': "0000140038181818183C00",
    'ó': "000008107CC6C6C6C67C00",
    'ò': "000020107CC6C6C6C67C00",
    'ô': "001028007CC6C6C6C67C00",
    'ö': "000028007CC6C6C6C67C00",
    'ő': "000014287CC6C6C6C67C00",
    'ú': "00000810CCCCCCCCCC7600",
    'ù': "00002010CCCCCCCCCC7600",
    'û': "00102800CCCCCCCCCC7600",
    'ü': "00002800CCCCCCCCCC7600",
    'ű': "00001428CCCCCCCCCC7600",
    'ů': "00102810CCCCCCCCCC7600",
    'ý': "000810C6C6C6C67E060CF8",
    'ÿ': "002800C6C6C6C67E060CF8",
    'Ç': "007CC6C6C0C0C0C67C1030",
    'ç': "000000007CC6C0467C1030",
    'Ñ': "342CC6E6F6DECEC6C6C600",
    'ñ': "00342C00DC666666666600",
    'Č': "28107CC6C6C0C0C6C67C00",
    'č': "000028107CC6C0C0C67C00",
    'Ď': "2810FC666666666666FC00",
    'ď': "02061C0C7CCCCCCCCC7600",
    'Ň': "2810C6E6F6DECEC6C6C600",
    'ň': "00002810DC666666666600",
    'Ř': "2810FC66667C6C6666E600",
    'ř': "00002810DE76606060F000",
    'Š': "28107CC6E0380CC6C67C00",
    'š': "000028107CC6701CC67C00",
    'Ť': "14087E7E5A181818183C00",
    'ť': "00143430FC303030341800",
    'Ž': "2810FE860C183062C6FE00",
    'ž': "00002810FE8C183062FE00",
}
char_codes = {k: bytes.fromhex(v) for k, v in char_codes.items()}

def format_message(msg_str):
    msg_bytes = b''.join(char_codes[c] for c in msg_str)

    MAX_PAGES = 8

    # Which pages have these flags
    flash = bytes([0b00000000])    # flash full screen
    marquee = bytes([0b00000000])  # pixel border around badge

    options = bytes([0b00000100]) * MAX_PAGES
    #                         ^ 0 => rtl, 1 => left-to-right
    #                        ^ scroll from bottom to top
    #                      ^^ scroll jump?
    #                  ^^^^ speed 0b1111 => slowest?!

    # page 0 has a size, rest of page has no size?
    msg_len = len(msg_str)
    sizes = bytes([(msg_len >> 8) & 0xFF, msg_len & 0xFF] + [0, 0] * (MAX_PAGES - 1))

    now = datetime.now()
    time_bytes = bytes([
        now.year & 0xFF, now.month + 1, now.day,
        now.hour, now.minute, now.second
    ])

    payload = bytes([0x77, 0x61, 0x6e, 0x67, 0x00, 0x00])
    payload += flash + marquee + options + sizes
    payload += b"\x00"*6 + time_bytes + b"\x00"*20
    payload += msg_bytes

    payload = payload.ljust((len(payload) + 15) // 16 * 16, b'\x00')

    yield from [payload[i:i+16] for i in range(0, len(payload), 16)]


async def main():
    print(f"Connecting to {device_address}...", end='', flush=True)
    client = BleakClient(device_address)
    await client.connect()
    print(" connected!")
    for chunk in format_message("HELLO"):
        await client.write_gatt_char("0000fee1-0000-1000-8000-00805f9b34fb", chunk, response=False)

if __name__ == "__main__":
    asyncio.run(main())

Passive bleak scanning:

async def main():
    args = dict(
        service_uuids=['0000fee0-0000-1000-8000-00805f9b34fb'],
        scanning_mode="passive",
        bluez=BlueZArgs(or_patterns=[
            OrPattern(0, AdvertisementDataType.COMPLETE_LOCAL_NAME, b'LSLED')
        ])
    )
    async with BleakScanner(**args) as scanner:
        async for device, adv in scanner.advertisement_data():
            print(f"Found it: {device=} {adv=}")
            client = BleakClient(device)
            print(f"Connecting ...", end="", flush=True)
            await client.connect()
            print(f" connected!")
            for chunk in format_message("CLOSE"):
                await client.write_gatt_char(CHAR_UUID, chunk, response=False)
            exit(0)